If the vectors \(\hat i - \hat j +λ\hat k, \ 4\hat i + 2\hat j + 9\hat k, \ 5 \hat i + \hat j + 14 \hat k \ \text{and} \ 3\hat i + 2\hat j + 7 \hat k\) are the position vectors of 4 coplanar points, then λ is equal to